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l <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> N' Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> IDEMCON Client Project ID ARCO 548 Stockton CA Sampled Aug 12 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Aug 14 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Aug 26, 1997 <br /> Attention Claudio Avila First Sample # 708-0493 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> Ng/L 708-0493 708-0494 708-0495 708-0496 708-0497 708-0498 <br /> MW-1 (55) MW-2(60) MW-3(62) MW-4(62) MW-5(60) MW-6 (59) <br /> MTBE ND ND ND ND 110 ND <br /> Reporting Limit 50 so so 50 50 50 <br /> I <br /> Duality Control Data <br /> Date Analyzed 08/18/97 08/18/97 08/18/97 08/18/97 08/25/97 08/18/97 <br /> lnstrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-7 GCHP-2 <br /> Surrogate Recovery, % 95 92 101 97 99 97 <br /> (QC Limits = 60-140%) <br /> Purgeadle Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected at or above the reporting iimit <br /> SEG OIA ANALYTICAL. ELAP #1624 <br /> i�fda Schneider <br /> Project Manager/Sacramento Laboratory <br /> f 7080493 EMC c 2> <br /> I <br />